Mitsubishi Montero (2002-2004). Manual — part 915
DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>
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DIAGNOSTIC TROUBLE CODE PROCEDURES
23Ac-143
STEP 3. Using an oscilloscope, check the vehicle speed
sensor waveform at PCM connector D-134 by backprobing.
(1) Do not disconnect connector D-134.
(2) Connect an oscilloscope probe to PCM connector D-134
terminal 79 by backprobing.
(3) Start the engine.
(4) Check the vehicle speed sensor waveform.
• The vehicle speed sensor waveform should show a pat-
tern similar to the illustration when running the vehicle.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 6.
NO : Go to Step 4.
AC204681AC
CONNECTOR: D-134
D-134 (GR)
61 62
63 64
65 66 67 68 69 70 71 72 73
82
89
81
88
80
79
78
77
87
86
85
76
75
74
84
83
AC204946 AG
OSCILLO-
SCOPE
PROBE
D-134 HARNESS CONNECTOR :
HARNESS SIDE
76
85
65
72
71
73
82
75
81
74
63 64
66
70
69
68
67
78
87
79
88 89
80
77
86
62
61
83 84
ACX02131
NORMAL WAVEFORM
(V)
AC
DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>
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DIAGNOSTIC TROUBLE CODE PROCEDURES
23Ac-144
STEP 4. Check joint connector D-116, PCM connector D-
134 and intermediate connector E-111 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC204171
CONNECTOR : D-116
AN
9 10
8
6 7
31 32
30
29
18 19 20 21
5
4
2
1
3
27
26
24
23
25
12 13 14 15 16 17
28
11
22
33
AC204681AC
CONNECTOR: D-134
D-134 (GR)
61 62
63 64
65 66 67 68 69 70 71 72 73
82
89
81
88
80
79
78
77
87
86
85
76
75
74
84
83
AC204176
CONNECTOR : E-111
BF
15
4
14
37
36
26 27
12
11
35
34
23 24
3
13
25
9
2
8
32
20 21
6
5
17
29
30
18
1
7
19
31
10
22
33
16
28
38
DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>
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DIAGNOSTIC TROUBLE CODE PROCEDURES
23Ac-145
STEP 5. Check the harness for open circuit or short circuit
to ground between combination meter connector D-03
terminal 65 and PCM connector D-134 terminal 79.
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair or replace the harness wire.
AC204170
CONNECTOR : D-03
CE
D-03 (GR)
58
57
67
66
56
54 55
64
59
53
52
62
61
63
65
60
51
AC204681AC
CONNECTOR: D-134
D-134 (GR)
61 62
63 64
65 66 67 68 69 70 71 72 73
82
89
81
88
80
79
78
77
87
86
85
76
75
74
84
83
DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>
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DIAGNOSTIC TROUBLE CODE PROCEDURES
23Ac-146
STEP 6. Check PCM connector D-134 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 7.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 7. Using scan tool MB991502, check data list item 29:
Vehicle Speed Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 29,
Vehicle Speed Sensor.
• Check that the speedometer and scan tool MB991502
display speed match when driving at a vehicle speed of
40 km/h (25 mph).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
− How to Cope with
Intermittent Malfunction
NO : Replace the PCM.
AC204681AC
CONNECTOR: D-134
D-134 (GR)
61 62
63 64
65 66 67 68 69 70 71 72 73
82
89
81
88
80
79
78
77
87
86
85
76
75
74
84
83
ACX01539AD
MB991502
16-PIN
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